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July 31.- 1923'- E. A, REYNO'LDS ET AL SOUND REPRODUCING INSTRUMENT Filed July 28, 1917 10 I J t J 7 volume, with means ratentcd July 31, 1923- uNlTED STATES PATENT OFFICE.

EDDIE! A. B IYIOLDS. OI YONKEBB,

NEW YORK, AND DE ELDER! A. REYNOLDS, OI

WEB! HOBOIER', NEW JERSEY, AISIGNORS, BY MESH! 10m, '10 AUDI- rnonn 6012111! or nannies, nnnswana.

Application fled July ill,

To all whom it may concern:

file it known that we, Eonm A. Barxonns and I): Ennmrr A. Rnrnoma, citizens of the United States of America, residing at Yonkers, count of Westchester, State of New York, and est lloboken, county of Hudson, State of New Jersey, have invented certain new and useful Improvements in Sound-Reproducing lngtruments of which the following ia a specification.

An object of this nvention is to provide an improved, simpleand effective means for magnifying the vibration of a diaphragzn wit llll an appropriate sound chamber uh I proper acoustic conditions to mechanically and electrically reproduce speech or sound waves electrically conveyed to the instrument, delivered in a magnified or amplified for regulating the voltime and intensity of the sound reproduced, controlling its quality timber and rotundity and ads. ted to control or modulate both mechanica y and electrically, sound vwaves emanating from -a telephone, phonograph, violin, born or other instrument. I

To accomplish this purpose, we prefer to use an electro-magnet attached to one pole of a permanent magnet so arranged as to bring the free end of the core of the electro-ina "et in close proximity with the free pole o the permanent magnet, that the flow of magnetic flux may always in as free and strong as possible, attaching by means of a pivot'iUr (pin a short thick armature to the free an of the permanent magnet, allowing it toextend over and become actuatcd by the electro-magnet.

()n the free end of the armature, we pro; fer to place a hook or attachment for en-" gaging a lever held substantially parallel to such armature, by means of a link orrod, one end of such lever being pivotally, connected with a die bra and the other end with an adjustab e screw for regulating the proximity of the armature. to the core of he electro-ma net, by means of a, link or rod and lever, t e latter being rovided with a notch or oove' to prevent t e link or red from slippi and for the further purpose may be intended, sue

QI NEW YORK, N. Y., A. CORPORATION OI IOUID-IIIBODUGIRG INSTRUMENT.

1m. mm Io. mains.

of keeping the in alignment.

We prefer to amass the diaphragm in a non-magnetic metal case with a large opening beneath, rigidly attached to the unanent ma at b means of a standard p vided with .a ug, fitted between the two pro or legs of the permanent magnet and old rigidly by means of a clamp and screw. The sound chamber above the diaphragm is referably made b the attachment of a at plate, with t e inner surface plain, co ted or recessed to suit the purpose for whi an particular instrument livariations being made serve all mufiler, an air-cushi0n in the reproduction 'of'harsh articulations, or for such modifications as may be found desirable "in the transmission and amplification of speech or music, provided with 0 hi an adjustable p ate, lined with felt, or other sound proof material with similar openings, held in place by a ferrule or nut. Such chamber can be conveniently formed by screwin the front plate into the flanges of the diap ra of the diap ragm between suitable washers or cushions and holding the front plate at the desired tension upon the diaphragm by means of a set screw. We have (iiscovered' that the form of the sound chamber with its adjustable open 'igs, in connection with a diaphra hov .ver actuated, afl'ords a wide range 0 V modulation in both timber and rotundity, whether in connection with a diaphragm operated mechanically, as with a stylus as in a phonograph, or electrically as with an electro magnet as in a receiver or vibratory, as in the ordina transmitter.

We find that a short, thic armature, with one and resting upon one he 'of the permanent magnet and the other a fljustable to the closest proximity of the ole of the electromagnet, so nearly competes the magnetic circuit as to make the eleotro-magnet unusually powerful and welladapted to electr0- mechanical amplification.

working parts permanently the front plate being also s, over which we place case, clamping the periphery Furthei' features and objects of the invention will be understood from the following description and the accompanying drawings, in wh1ch- Fi 1 is a central longitudinal section of one orm of our invention; 7

Fig. 2 is a transverse section on line2-2 of Fig. I, viewed in the direction of the indicating arrows;

Fig. 3 is a to plan view of Fig. 1, with the born or ot1er. external sound passage meansomitted r Fig. 4 is a detail side elevation of certain parts of Fig. 1; and

Figs. 5 and 6 are side and top plan detail views of a modified form of permanent and electric magnets.

In the drawings forming a part of our specification, 1 represents a permanent magnet of the horse-shoe variety, with one pole considerably longer than the other, to which is permanently attached the core of an electro-magnet 2, the core extending from the long log of the permanent magnet into close proximity with the short leg of the permanent magnet. 3 represents a short, thick armature of soft iron held firmly to the short leg of the permanent magnet by magnetic force, and prevented from dislocation by a small pin preferably attached to the armature and working freely in an opening in the upper surface of the short leg of the permanent magnet.

4 is a lever connecting with a screw rod 5, leading to a diaphragm 6, and connecting with the adjustable screw rod 7. -8 is a counter-sunk screw-nut attached to the screw rod 7, designed to regulate the armature 3 through the lever 4 and link or rod 9. The lever 4 is provided with a notch 4 or groove to prevent the link or rod 9 from slipping. and also whereby the link 9 actuates the lever 4 through a lever arm which is substantially constant for different positions of adjustment set by the adjusting means comprising the screw rod 7 and the nut 8. It will be further noted that the direction of adjustment effected by the adjusting means is in the direction, i. e., urallel thereto, of the directioirof actuatlon of the diaphragm. In the specific form of the invention shown in the drawings, the actuating mechanism comprises a minimum number of parts, movably connected to one another at substantially constant points: in such preferred embodiment, the parts. of the actuating mechanism are arranged substantially in a common plane and the adjusting means oonstructed to provide movement of adjust mesa-12 10 is a set screw for holding the faceplate 11 at a proper tension upon the diaphragm, the face-plate being provided with a screw extens1on'l2 to receive a born attachment or other device, and upon which is held the adjustable plate 13? The'faceplate is also provided with arcuate openings 17, 17, 17, 17 connecti gwith the sound chamber 14, and carries 'a adjustable plate 13 lined with a felt or other sound-proof material, and having similar arcuate openings, which upon arc ial adjustment of more or less register, constitutes means for regulating the extent of opening of the openings in the face-plate in whole or in part.

18 is a non-magnetic metal case, rubber or fibre composition, containing arecess for receiving the diaphragm 6, and the faceplate 11 rigidlyattached to the permanent magnet 1, by means of a standard 19, lug 20, clamp 21 and screw 25. 22 is a box or receptacle of insulating material or composition, with interior lugs 23, 23, 23, 23, for fastening the diaphragm case to the receptacle, and terminal screws 24, 24, for connecting the wires of the electro-magnet 2 with induction coils, relays, line wires or such other-exterior sources of current as may be found desirable.

Means are also provided for securing the non;magnetic metal case 18 to the box or receptacle 22, such as screws 26 passing through the rim of the case 18. into lugs 23, 23, etc. Any desired number of external lugs 27, 27, may be employed for fastening the case 18 to a wall, desk, or other support.

In Figures 5 and 6, we have shown a modification in the construction. and arrangement of the permanent magnet and the electro-magnet, employing for simplification in manufacture a set (two being shown) of permanent magnets 30, 31, disposed side by side with the block 32 of soft iron between the short legs of the permanent magnets and block 33 between the curved portions of the permanent magnets. The core 34 of the electro-magnet 35 is cut away or recessed at 36 to be received between the long legs of said permanent magnets 30, 31, thereby forming a substantially integral connection with the poles and legs of said permanent magnets 30, 31.

From the above it will be observed that the device is especially adapted to loud speaking receivers for announcing trains, paging, for equipment on trains for announcing stations, transmission of music advertising and other uses. In the use 0% the invention in connection with a sensitive transmitter, as in the equipment in churches, theatres, and large halls, a plurality of such devices is distributed in suitable parts of the auditorium for the purpose of equalizing articulation, whereby amplified reproduction is obtained at any point in such auditorium,

' simultaneously from all such devices.

' will be underst Whereas we have described our invention 3 modificationsmay be made without departi P I" mg said in from the invention.

, at we claim as our invention and desire to secure by Letters Patent of the United States 1'. A sound reproducing instrument coma diagihragm andmeans for operatp ragm,comprising a permanent magnet, electro magnet, an armature magnetica ly attached to one ole of said permanent magnet, a lever, said ever having a substantially constant lever arm and means actuated by said'arinature and actuating said lever through such substantially constant lever am. i

2. sound reproducing instrument comrising a diaphragm and means for operatmg and diaphragm, said means including a permanent magnet, an armature pivotally connected with said permang nt magnet, a lever having one end connetiied with said diaphragm. means for en porting the opposite end of said lever, all supporting means including an adjustable element, means for connecting said armature withsaid lever intermediate said ends, the lever arm of said connecting means being substantially constant for different adjustments of said adjusting element. s

3. sound reproducing instrument comrising in combination a diaphragm, means or operating said diaphragm, mumming means for said diaphragm, said hollow mounting means inclu ing a face provided with a sound pamage opening and a plurality of openings adapted to communicate directly with the atmosphere disposed laterally of said sound passage opening, and means for varying the effective extent of opening of said plurality of openings.

4. A sound reproducing instrument com-. prising in combination a casing of non-magnetic and electrically insulating material, and having an open end, a plate for said open end, a diaphragm mounted in sin plate, magnetic means carried bv said plate, an armature for said magnetic means, a lever, a link connecting one end of said lever with said dia hragm, a link connecting said armature wit said lever, arfid mgaps forfsupi the 0 its end 0 sai ever mm 2?; l atm'said upporting means including an 'justable element, said armature connecting link being related to said one end of s aid lever to have a substantially c1 lS'tflllt lever arm for dill'erent adjustments of sai adjustable element.

a .5, A sound reproducing instrument comprising in combination a casing of non-ma netic and electrically insulating material a (1 having an open end, a plate for said open end, said plate bein provided with openings, means for regu sting the ell'ective excific forms thereoffiwgnt pf opening of said openings, a diah'fagm mounted in said means carried by said p ate, an armature for said magnetic means, a lever, a link connecting one end of said lever with said die hra a link connecting said armature wit sai lever and means for supporti the op its end of said lever from said gate, sal supporting means including an a justable elemenhsaid armature connecting link being related to said one end i said lever to have a substantially consta: lever arm for difierent adjustments of said adjustable element.

6. A sound reproducin instrument compriein in combination a iaphragm, an arm' carri by said diaphragm, a lever, pivotal means for an end portion of said lever, adjustable means for carryin said ivotal means, means for pivoting t e opposite end portion'oi said lever to said arm, a link connected to an intermediate portion of said lever, the portion of said lever between said second mentioned pivoting means and said link being 01 constant len h for different.

positions of adjustment 0 said adjustable men an armature connected to said link and o ectroic means controlling said armature, sai electromagnetic means including a coil. 7

A sound reproducin inftrument comp in com mation a iap ragm, an arm carrizd by said diaphragm, a lever, a member pivotally connected to an end portion of said lever means for adjustably supporting said mom r, means for pivoting t opposite end portion of said lever to said arm, the distance from the pivotal connection of said member at said end portion of said lever to the pivotal connection of said pivoting means at said opposite end rtion of said lever being constant for dlfl'erent sitions of ad ustment of said supporting means, a link conn at its one end to a portion of said lever intermediate said end rtions of said lever,

an armature controlling said link and electromagnetic means controlling said armature,lsaid electromagnetic means comprising a col 8. A sound reproducing instrument comrising in combination a diaphragm, a casmg supportin said diaphragm, an arm carried b said iaphragm, a lever,a member pivota 17 connected adjacent an end portion of said lever, means for adjustably supporting said member from said casing, means d for pivoting the opposite end portion of said lever to an arm, t e distance from the pivota connection -of said member at said end portion of said lever to the pivotal connection of said pivoting means at sai late, magnetic prising in combination a opposite end portion of said lever being constant for different ositions of adjustment of said adjustaiizly supporting means, a link connected to said lever at a portion thereof intermediate said end portions, an armature controlling said link and electromagnetic means controlling said armature said electromagnetic. means including a coil 9. A sound reproducing instrument comdiaphragm, a ring carrying said diaphragm, an arm carried i said diaphragm, a lever, means for pivotin an end portion of said lever to said arm, means for adjustably positioning the opposite end portion of said lever, the distance from the pivotal connectionof said pivoting means at said end portion of said lever to the pivotal connection of said adjustably positioning means at said opposite end portion of said lever being constant for all po sitions of adjustment of said adjustably sitioning means, said adjustably ositionmg means comprising an adjustable e ement carried by said ring, a link movably connected at its one end to an intermediate portion of said lever, an armature controllin electromagnetic means control ing said armature, said electromagnetic means ineluding a coil and a easing carrying said said link ring and enclosing said lever and said armor ture and said electromagnetic means.

In testimony whereof we have signed this speoifieatirm, this 26th da of Jul 1917.

EGBERT A. R YNOL S. DE ELBERT A. REYNOLDS; 

